Tension device.



e. L. BROWNELL.

TENSION DEVICE.

APPLICATION FILED FEB 15. 1915.

Patented 0ct.16,1917,

WW mm Mfmasm.

I saunter i pienowlgrnrn 'OFTWORCESTER, MASSACHUSETTS.

To all whom it may 210mm:

Be it known that I, Gnoneiili. *BROWNELL,

a citizen oftli'e United States, residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have V vented a new an'duseful' Improvement i Tension Devioesfof which the: following; together with the" accompanying drawings,

a tioii with"wtwisting machine-iii. which multiplicitybf threads are twisted into a sii gle cord, theythreads forming each of the cords being wourfd' upona common is specification; 1 t

My present inyentioirmelatesto atension dei ioeespecially adapted foriise in connee beam! The objects of my invention are to applya uniform tensionyto each of the indizowill be uniformlyfresisted byall its compo viclual threadsformingtheltwisted cord so nent threads, and to) apply a uniform tension tothe twisted cord asit is laid'upon the windingspools of Itheinachine.

s li uiiiiormgtension of the cord and also oi the individual threads composing I it is 'dee but in many tw sted cords it becomes afiiecessity as, for examplepin sirous" in all cases,

we) o t ste 'itht d f mrl yd in leather sewing inaehin'e'sIv f 5 t I accomplish the? above objects,

a others, by means of; the mechanism hereinafter described; the novel features being pointed out in theanne zed claims. n

1 Referring to the accompany ng drawings,

Figure 1 is a front elevationet' a twisting machine for twisting v a multiplicity of threadsinto a single cord, thethr'ead's toibe" twisted being arranged in groups upon singlebeam.

Figure 2 is an end View of that portion of the framework of the machine upon which fthe beams are support d,

Fig. 3 is a plan View upon a smaller scale of the two thread beams and Fig. a is a diagrammatic View illustrating the operation of the tension device at dlflerent diameters ofth'e beam.

Similar reference characters refer to simiv lar parts in the different figures.

]Referring to the accompanying drawings, ldenotes the framework of a twisting ma- 1 chine, a portion ofwhich is shown in front a: elevation in Fig.1: Supported in the framework 1 in vertical bearings are a series of twisting heads 2 arranged in rows upon the the rotation of the beam 4: to give the desired tension to the individual threads 1 as they are unwound from the'beam.

' msmarimmaf 3. The constructionand operation of the twisting heads form no part of mypresent invention and are, therefore, not; described in detail as they are ofthe common form by which a multiplicity of threads are'twisted and laid upon thewinding spools by means of revolving fliers. l

The threads to be twistedare arranged in ispecificatien of Lettersletent, f P t nt d 0 1- 1 1917,, A fiiia'fionfiied February 15,1915. seria No. 8,147.. g i

'65 groups and wound upon a beam 4 supported io ertical brackets 5 m0unted upon' the framework of the machine, Each group of threads to be twisted in a single cord are takenfrom the beam and earned around uponthethreiidswound upon the beam,

thereby imparting a sufiici'ent resistance to i pins; GllSlCl in a triangular framework 16?- {and alsoaround pins 7 in theframework of-f the machine. From the pins 7 the-assembled "j threads are carried to the twisting. heads "2. An initial tension is imparted to each group of threads as it'istaken from, the

Asthe threads are unwound; the diameter I ofthejbeam 4 is constantly decreasingand the resistanceto therotation of the beam must also-"decrease in order togpreserve a uniform tension upon" the threads; I aocomplishthis result by continually decreaSJ ing the effective pressure of the weight 8".-

upon the threads as the diameter of the beam decreases, and I accomplish this by carrying The rod 10 is j ournaled in bearings 11 which are swiveled upon the ends of adjusting screws 12 12 held in screw threaded holes in arms 13, supported upon the brackets 5, which permit the rod 10 to be raised or lowered. The diameter of a filled beam is represented in Fig. 2 by the broken line 14, and the diameter of a substantially emptied beam by the broken line 15. The maximum effective pressure of the weight 8 upon the threads of the beam will be exerted when the rod 10 is at the proper elevation to hold the arms 9 in a horizontal plane, as represented in Fig. 2. As the diameter of the beam diminishes and gradually approaches the'diameter indicated by the broken line 15, the weight 8 will fall and its effective presjth'eitwe ight 8 upon the free ends or 'arms S) which are pivotally held upon a rod 10.

sure become gradually reduced, being the smallestwh'enit has assumed the position indicated by the broken line 16, Fig. 2.

When the tension. device is applied to -a filled beam, the rod 10 is adjusted vertically to produce the requisite pressure ottlie g If the pressure of the Weight 8 is found too great, ther'od 10'i's Weight 8 upon the threads.

raised in the arms 13 to bring the ,arm S at an oblique angle to a horizontal plane, there y: re u ng he effect e l 'Q B f the weightBnpon thethre aids, 1 The under side a the threadsofthef beam advances along the, ,1

' 17 of, theweight 8 1$ Cl1l'V8d so that, as, the

Weight 8 descends, the curved surface will be substantially tangential in any position to the cylindrical contour of the beam, and

the surface of the eightS in contact with th threads will remain cO ant as indicated by the diagram shown in Fig. .4, hich representsqthe weight 8 in five different positions, 64,1), 0, do and e, and having the surface 17; so curved that its ,contaetwith the threads of the beam will, in each position,

formv thesame angle with the radial line 1.8, f

18 ofthe beam, The radial line 18, 18 forms a rightangle to the line 19 Which'joins the pointof contact 20 of: the eight 8 Withthe threadsof a full beamand the axis 21 of the, swinging, arm 9; Asthe Weight descends through the "different positions I), 0, d "and e, the point of contact of the weight 8 with eurvedjsurface 1-7 to the positions 22,23, 2%

and 25..succiessivelmgand the angle forined by the radial line 18,,1 8 iththe lines 26,

27, 28 and 29 increases: in obliquity as the Weight 8 descends. ,As the radialline 18, 1 8 7 pre e ts h eetion n. Wl1 1L 2 of gravity; acts; on the, eight 8, the effective;

scent ls and thereby compensate for the inr a e in f r ev required torotate the beam bygtheiwithdrawal of its threads at a concoliiisf rth s patent may be obtainedpfor size and t i st,

tionsayith said. bearings;

pressure of the weightup on the threadsi of the beam; will deerease -as therweight de K stantlyf decreasing, diameter of the I NVeights 30 are adjustably held upon ,the

arms 9 by a clamping screw 31; By the-adjustment of the Weights 30 and also by raising the axes of the arms 9;,theinitial efifeetive pressure of the Weights 8 may be adjusted as desired, thereby enabling the operator to "regulate With great nicety the tension upon the individual threads as they sare with-: drawn from vthe beam. By the delicate adjustment and uniformity of tension upon the threads delivered from the arpbeam I am enabled to produce aftwisted eord oi uniform tensile i and more .uniformfin I llna and carried u'p on'the free ends of armsr piv otally held upon a horizontal rod .supported in adju table"beaaag ,jami meansifer fyerti cally:adjustingsaid bearings, Consisting of t V l. a, ,tension derice, combination with a v.tln' ead 'bealn,of a We ght arranged f to rest upon tllethreaclsheld on said beam adjusting sgreu s having swiveled connecv 2.v In, ,a t'ension'fdevice," the combination 7 with it -thfggyd bQannof Weight arranged to rest up oirthe threadS Held on; said beam, perpendieiilai l'y abo eithefaxi's of said beam,

curved to present substantially uniform Wei arms beam,

otally held at one me ns for; rertica With the under sideiof said weighthoonvexly pix' otal'sii pport andj adj u'st e Weig ts vca ri d@111isa liarms 1 emmer.

VVit nes ses: 7 V V V V v PnnELorn COI IBERBAGH, 1 Gno. KENNEDY Jr; '1

Washington, at, y

fivejcentsleachi, by addressing {the fqo znnlissi oner 'ofi Patents, 

